Title :
Measurement of moisture spatial profiles in transformer pressboard
Author :
Mamishev, A.V. ; Du, Y. ; Lesieutre, B.C. ; Zaha, M.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA, USA
Abstract :
Moisture concentration was measured in a 1.5 mm thick transformer pressboard as a function of time and position during moisture diffusion process. A flexible interdigital three-wavelength sensor was used to provide the necessary information regarding pressboard dielectric properties at different depths from the sensor-pressboard interface. Results were obtained by processing the signals from the three-wavelength sensor, air humidity sensor, and thermocouple installed in the experimental chamber. Air-pressboard equilibrium curves were used to provide boundary conditions and the relative moisture level magnitude. The proposed technology has significant potential for measurement of diffusion processes in various dielectrics
Keywords :
humidity sensors; insulation testing; moisture measurement; power transformer insulation; thermocouples; 1.5 mm; air humidity sensor; air-pressboard equilibrium curves; boundary conditions; flexible interdigital three-wavelength sensor; moisture concentration; moisture diffusion process; moisture spatial profiles; relative moisture level magnitude; sensor-pressboard interface; thermocouple; three-wavelength sensor; transformer pressboard; Boundary conditions; Dielectric measurements; Diffusion processes; Humidity; Moisture measurement; Position measurement; Signal processing; Thermal sensors; Thickness measurement; Time measurement;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1998. Annual Report. Conference on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-5035-9
DOI :
10.1109/CEIDP.1998.733995
